Consider:
enum Line {
case Horizontal(CGFloat)
case Vertical(CGFloat)
}
let leftEdge = Line.Horizontal(0.0)
let leftMaskRightEdge
As others have pointed out, this is now kind of possible in Swift 2:
import CoreGraphics
enum Line {
case Horizontal(CGFloat)
case Vertical(CGFloat)
}
let min = Line.Horizontal(0.0)
let mid = Line.Horizontal(0.5)
let max = Line.Horizontal(1.0)
func doToLine(line: Line) -> CGFloat? {
if case .Horizontal(let value) = line {
return value
}
return .None
}
doToLine(min) // prints 0
doToLine(mid) // prints 0.5
doToLine(max) // prints 1